Stool



FIG. 1 is a front top perspective view of a stool showing my new design;

FIG. 2 is a rear top perspective view;

FIG. 3 is a front view;

FIG. 4 is a rear view;

FIG. 5 is a left side view;

FIG. 6 is a right side view;

FIG. 7 is a top view of my new design; and,

FIG. 8 is a bottom view thereof.

The broken lines shown in FIGS. 1, 2 and 8 represent environment only and form no part of the claimed design. 

CLAIM The ornamental design for a stool, as shown and described. 